Abstract
A concept for the application of a magnetocaloric device in energy-efficient air conditioners is introduced. In order to evaluate this concept, a test stand has been developed equipped with a magnetic field source providing about a 1.5-T flux density change into which different regenerator geometries can be implemented and evaluated. A processing route for the production of profiled magnetocaloric LaFeSiMn-based composite plates by tape casting is presented. The processed plates show a maximum isothermal entropy change of about 3.8 J kg - 1 K - 1 at a magnetic field change of 1.5 T at 285 K. The hydraulic and thermal performance of regenerator geometries that can be realized by profiled plates is assessed by calculations.
Highlights
In addition to efforts to decarbonize energy systems, a major focus of the energy transition lies on increasing the efficiency of energy systems
The heating and cooling capacity, which is dissipated by the magnetocaloric material, is transmitted to the supply and exhaust air volume flow of the Desiccant Evaporative Cooling (DEC) air-conditioning system by means of a heat transfer medium and a heat exchanger
With a limit power of QMCU = 377 W for heating and cooling, the remaining, necessary heating output can be reduced to QDEC,heat = 643 W, which means a reduction of 58%
Summary
In addition to efforts to decarbonize energy systems, a major focus of the energy transition lies on increasing the efficiency of energy systems This can be seen in the efforts to replace conventional low-temperature technology with systems based on a condensing boiler or a heat pump. As an alternative to conventional air-conditioning systems, Desiccant Evaporative Cooling (DEC) systems are available, which no longer require compression refrigeration machines Instead, this process needs humidifiers and a (ideally regenerative [1]) heating source to work [2]. This process needs humidifiers and a (ideally regenerative [1]) heating source to work [2] Another alternative promoted currently is solid-state cooling by exploiting the magnetocaloric effect of a magnetic material. Measurements are currently being carried out, and the results and the comparison with other MCU concepts will be presented in a subsequent publication
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